A somewhat easier solution is to get a "black light" out of your attic from
when you had all of those black light posters in high school...they transmit
mostly UV-A. Have someone stand on the outside of your trailer at night and
crawl inside to see what light is transmitted. Little if any gets through
but you would do best to prove it to yourself.

Besides it may even inspire you to take a trip down to the local "head shop"
and buy a few more posters of Jimi Hendrix. ;-)

Casey Lenox
KC
Phoenix